X-ray-tube vacuum-controller.



C. GAVEAU.

X-RAY TUBE VACUUM CONTROLLER.

APPLICATION FILED APB.. 19, 1912.

Patented Nov. 26, 1912.

l y M WZ /b sZoLUMBIA PLANOGRAPH C04, WASI-"NOYONY D. c.

rica.

X-RAY-TUBE VACUUM-CONTROLLER.

Speccaton of Letters Patent.

Patented Nov. 26, 1912.

Application filed April 19, 1912. Serial No. 691,859.

To all whom it 'may concern:

Be it known that I, CRAN GAvEAU, a citizen of the Republic of Haiti, at present residing in the borough of Wanhattan, city, county, and State of New York, have invented an Improvement in X-Ray-Tube Vacuum-Controllers, of which the following is a specification.

Heretofore, various devices have been employed for controlling, that is to say, lowering or reducing the vacuum in X-Ray tubes to suit working conditions thereof, but so far as I am aware, none of these devices have been reliable or durable in use, nor have they been positive in action.

The object of my present invention is the provision of a simply constructed and yet durable controller for the vacuum in X-ray tubes by the use of which a certain predetermined positive and always equal quantity of air may be admitted to the interior of the vacuum tube every time the apparatus is operated, as will be hereinafter more particularly described.

In the drawing, Figure 1 is a central longitudinal cross section illustrating the X- ray tube vacuum controller, made in accordance with my invention. Fig. 2 is a plan view thereof. Fig. 3 is an elevation of one of the valves, and Fig. 4 is an elevation of the other valve.

Referring to the drawing, my improved X-ray tube vacuum controller comprises a vessel 10, which is preferably cylindrical and made of aluminum, although as will be understood, it may be made of any other suit-able material. The vessel 10 is preferably closed at one end and open at the other, and at the open end is provided with a cover 11, having a flange 12, by means of which, through suitable screw threads or otherwise, the cover is attached to t-he vessel. At diametrically opposite points, the cover 10 may be provided with lugs or ears 13 to assist in handling the device in its operation. The cover is also provided with a lug 14, through which there is a suitable bore,

l and the outer walls of the lugs 14 are preferably tapering and form a valve seat, as will hereinafter be described. Secured to the cover at suitable points, I also prefer to employ hooks indicated at 15, the purpose and function of which will also be hereinafter described.

Attached, preferably centrally, to the bottom of t-he vessel 10, and extending through the same, is a pipe or tubular connection 16. This pipe 16 is surrounded by an annular sleeve 17, to which by any suitable means the apparatus is secured to the walls of the X-ray tube, indicated diagrammatically at 18, it being understood that both the pipe 16 and the annular sleeve 17 extend through the walls of the vacuum tube and into the interior thereof. The orifice at the inner end of the tube 16 forms one of the discharge ports 19 of the apparatus. In a suitable position adj acent to its open end, the vessel 10 is provided with an inlet port 20, and in a corresponding position adjacent to its closed end, the vessel is provided with a discharge port 21, and ports 20 and 21 are preferably connected exteriorly of the vessel by a pipe 22. I also employ a pair of valves 23-211- made of rubber or other similar resilient material adapted to fit within the vessel 10. The valve Q3 is the upper or outer valve, and the valve 24 is the lower or inner valve. Both these valves are preferably cylindrical and the valve 23 is provided longitudinally with a slot E25 extending from the top to the bottom thereof, and approximately centrally with the transverse recess 26. The upper portion of this valve is also provided with a conically recessed portion 26', adapted when this valve is raised to cont-act with the surface of the lug 14. The valve 24 is also longitudinally slotted, as indicated at 27. This slot 27 extends from the upper or outer surface of the valve t-o the transverse recess 28 therein, which is located approximately at the center of the valve. l further employ a valve stem, which is preferably made in three parts, indicated respectively at Q9, 30 and 31. The ends of the stem part 30 are preferably reduced in cross section and are screw threaded and adapted to be received in tapped ends of the stem portions 29 and 31 to connect the respective parts of the stem.

Between the stem parts 29 and 30 is a valve disk 32, adapted to be received and fit within the recess 26 in the valve 28, it being understood that the stem part 30 and the adjacent portion of the stem part 29 pass centrally through the valve 23. On the end of the stem partv 30 is a valve disk 34, adapted to be received and ft within the recess 28 in the valve 2-1, and the stem part 31 passes through a hole provided therefor in the valve 24. Secured between the stem parts 80-31 and located between the valves 23-24, I employ a division plate 33. The stem part 29 extends through the bore provided in the lug 111 and through the cover 11, and at its outer end is connected to a cross piece 36 provided with a loop or thumb ring 35, by which the valve stem and valve may be moved. I also employ a pair of springs 37, one end of which is suitably connected in the cross piece 36, and the opposite ends of which are connected to the hooks 15.

From the foregoing description, it will be apparent that by the action of the springs 37, the valve stem and the valves thereon, will be maintained in the normal position which is shown in F ig. 1 of the drawing, and in which position the discharge ports 19 and 21 are closed by the valve 24C and the inlet port 20 and the opening between the cover and the valve stem, which, as will be understood, is another inlet port, are open. In the operation of the apparatus, it will also be understood that the pipe or tube 22 will contain, or may be made to contain, (depending upon its size) a certain pre-determined quantity of air, and by moving the valve stem outwardly, the valves 23 will be raised to cover the inlet ports and at the same time the valves 24 will be moved sufficiently far to uncover the discharge ports, whereby, due to the vacuum in the X-ray tube, the air, previously entrapped in the pipe or tube 22, will expand or rush into the vacuum tube. It will also be obvious that this operation may be repeated at the pleasure of the operator, and that every time the apparatus is actuated, a pre-determined quantity of air, namely, that contained within the pipe 22, will be permitted to pass into the X-ray tube. The valve stem 29 works sufficiently loosely in the bore provided for it in the cover 11 to permit this bore to also act as an inlet port for the cylinder 10.

I claim as my invention:

1. A vacuum regulator for X-ray tubes, comprising a casing having inlet and discharge port-s, devices by which the discharge ports are normally closed and the inlet ports normally opened, means for operating said devices to open the discharge ports and close the inlet ports, and means whereby in such operation of the saiddevices a predetermined quant-ity of air is admitted to the X-ray tube to which the regulator is attached.

2. A vacuum regulator for X-ray tubes, comprising a casing having inlet and discharge ports, a cover, a valve for controlling the inlet ports, a valve for controlling the discharge ports, means for operating said valves, and means whereby in the operation of the said valves a predetermined quantity of air is admitted to the X-ray tube to which the regulator is attached.

3. A vacuum regulator for X-ray tubes, comprising a casing having a discharge port leading to the X-ray tube, to which the regulator is attached, a device secured to the casing and having a discharge port therefrom into the casing adjacent to the end in which the aforesaid discharge port is located, and an inlet port into the casing at the opposite end thereof, a valve for controlling the inlet port of the said device, a valve for cont-rolling the said discharge ports, and means for normally maintaining the last aforesaid valve in position to close the said discharge ports.

4t. A vacuum regulator for X-ray tubes, comprising a casing closed at one end and open at the other, a connection at the closed end of the casing provided with a discharge port communicating with the interior of the X-ray tube to which the regulator is attached, a pipe attached eXteriorly to the casing, having a discharge port communicating with the interior of the casing adjacent to the closed end thereof, and an inlet port communicating with the interior of the casing adjacent to the open end thereof, a cover litt-ing the open end of the casing, a valve stem passing through the said cover, the bore through which t-he valve stem passes providing for an inlet port to the said casing, a valve on the said valve stem for opening and closing the said discharge ports, another valve on the said stem for opening and closing the said inlet ports, and means for normally maintaining the said valves in such a position that the discharge ports are closed.

5. A vacuum regulator for X-ray tubes, comprising a casing closed at one end and open at the other, a connection at the closed end of the casing provided with a discharge port communicating with the interior of the X-ray tube to which the regulator is attached, a pipe attached exteriorly to the casing, having a discharge port communicating with the interior of the casing adjacent to the closed end thereof, and an inlet port communicating with the interior of the casing adjacent to the open end thereof, a cover lit-ting the open end of the casing, a valve stem passing through the said cover, the

bore lhrough which the Valve stein passes springs connecting the Cross piece with Jhe providing for an inlet port to the said cas- Cover. 10 ing, a Valve on the said Valve stem for open- Signed by me this 15th day of April, 1912. ing and closing the said discharge ports, an- CRAN GAVEAU other valve on the said stem for opening and closing the said inlet ports, a cross piece se- Vt-nesses:

cured to the Valve stem exteriorly of the Cas- BERTHA M. ALLEN,

ing, a ring secured to the cross piece and J. B. LE BLANC.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C, 

